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/** @file
 *
 *  Battery volt meter for Segbot version 2.
 */

#include <Arduino.h>
#include <voltmeter.h>

/** Conversion for DFRobot Analog Voltage Divider DFR0051 V2.
 *
 *  The device divides the raw battery current by five, so a full
 *  range 5v input on analog pin 0 corresponds to 25v input.
 */
static const float V_CONVERSION = 40.92;

/** Poll interface.
 *
 *  When this function is called periodically, it reads the battery
 *  voltage, sending it in a serial message.
 */
void Voltmeter::poll(void)
{
  float v = analogRead(0) / V_CONVERSION;

  Serial.print("V");
  Serial.println(v);
}
